4 * Definitions for talking to the Open Firmware PROM on
5 * Power Macintosh and other computers.
7 * Copyright (C) 1996-2005 Paul Mackerras.
9 * Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
10 * Updates for SPARC64 by David S. Miller
11 * Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
18 #include <linux/types.h>
19 #include <linux/bitops.h>
20 #include <linux/errno.h>
21 #include <linux/kobject.h>
22 #include <linux/mod_devicetable.h>
23 #include <linux/spinlock.h>
24 #include <linux/topology.h>
25 #include <linux/notifier.h>
27 #include <asm/byteorder.h>
28 #include <asm/errno.h>
37 struct property *next;
39 unsigned int unique_id;
40 struct bin_attribute attr;
43 #if defined(CONFIG_SPARC)
44 struct of_irq_controller;
51 const char *full_name;
53 struct property *properties;
54 struct property *deadprops; /* removed properties */
55 struct device_node *parent;
56 struct device_node *child;
57 struct device_node *sibling;
58 struct device_node *next; /* next device of same type */
59 struct device_node *allnext; /* next in list of all nodes */
63 #if defined(CONFIG_SPARC)
64 const char *path_component_name;
65 unsigned int unique_id;
66 struct of_irq_controller *irq_trans;
70 #define MAX_PHANDLE_ARGS 16
71 struct of_phandle_args {
72 struct device_node *np;
74 uint32_t args[MAX_PHANDLE_ARGS];
77 /* initialize a node */
78 extern struct kobj_type of_node_ktype;
79 static inline void of_node_init(struct device_node *node)
81 kobject_init(&node->kobj, &of_node_ktype);
84 /* true when node is initialized */
85 static inline int of_node_is_initialized(struct device_node *node)
87 return node && node->kobj.state_initialized;
90 /* true when node is attached (i.e. present on sysfs) */
91 static inline int of_node_is_attached(struct device_node *node)
93 return node && node->kobj.state_in_sysfs;
96 #ifdef CONFIG_OF_DYNAMIC
97 extern struct device_node *of_node_get(struct device_node *node);
98 extern void of_node_put(struct device_node *node);
99 #else /* CONFIG_OF_DYNAMIC */
100 /* Dummy ref counting routines - to be implemented later */
101 static inline struct device_node *of_node_get(struct device_node *node)
105 static inline void of_node_put(struct device_node *node) { }
106 #endif /* !CONFIG_OF_DYNAMIC */
108 /* Pointer for first entry in chain of all nodes. */
109 extern struct device_node *of_allnodes;
110 extern struct device_node *of_chosen;
111 extern struct device_node *of_aliases;
112 extern struct device_node *of_stdout;
113 extern raw_spinlock_t devtree_lock;
116 static inline bool of_have_populated_dt(void)
118 return of_allnodes != NULL;
121 static inline bool of_node_is_root(const struct device_node *node)
123 return node && (node->parent == NULL);
126 static inline int of_node_check_flag(struct device_node *n, unsigned long flag)
128 return test_bit(flag, &n->_flags);
131 static inline int of_node_test_and_set_flag(struct device_node *n,
134 return test_and_set_bit(flag, &n->_flags);
137 static inline void of_node_set_flag(struct device_node *n, unsigned long flag)
139 set_bit(flag, &n->_flags);
142 static inline void of_node_clear_flag(struct device_node *n, unsigned long flag)
144 clear_bit(flag, &n->_flags);
147 static inline int of_property_check_flag(struct property *p, unsigned long flag)
149 return test_bit(flag, &p->_flags);
152 static inline void of_property_set_flag(struct property *p, unsigned long flag)
154 set_bit(flag, &p->_flags);
157 static inline void of_property_clear_flag(struct property *p, unsigned long flag)
159 clear_bit(flag, &p->_flags);
162 extern struct device_node *of_find_all_nodes(struct device_node *prev);
165 * OF address retrieval & translation
168 /* Helper to read a big number; size is in cells (not bytes) */
169 static inline u64 of_read_number(const __be32 *cell, int size)
173 r = (r << 32) | be32_to_cpu(*(cell++));
177 /* Like of_read_number, but we want an unsigned long result */
178 static inline unsigned long of_read_ulong(const __be32 *cell, int size)
180 /* toss away upper bits if unsigned long is smaller than u64 */
181 return of_read_number(cell, size);
184 #if defined(CONFIG_SPARC)
185 #include <asm/prom.h>
188 /* Default #address and #size cells. Allow arch asm/prom.h to override */
189 #if !defined(OF_ROOT_NODE_ADDR_CELLS_DEFAULT)
190 #define OF_ROOT_NODE_ADDR_CELLS_DEFAULT 1
191 #define OF_ROOT_NODE_SIZE_CELLS_DEFAULT 1
194 /* Default string compare functions, Allow arch asm/prom.h to override */
195 #if !defined(of_compat_cmp)
196 #define of_compat_cmp(s1, s2, l) strcasecmp((s1), (s2))
197 #define of_prop_cmp(s1, s2) strcmp((s1), (s2))
198 #define of_node_cmp(s1, s2) strcasecmp((s1), (s2))
201 /* flag descriptions */
202 #define OF_DYNAMIC 1 /* node and properties were allocated via kmalloc */
203 #define OF_DETACHED 2 /* node has been detached from the device tree */
204 #define OF_POPULATED 3 /* device already created for the node */
205 #define OF_POPULATED_BUS 4 /* of_platform_populate recursed to children of this node */
207 #define OF_IS_DYNAMIC(x) test_bit(OF_DYNAMIC, &x->_flags)
208 #define OF_MARK_DYNAMIC(x) set_bit(OF_DYNAMIC, &x->_flags)
210 #define OF_BAD_ADDR ((u64)-1)
212 static inline const char *of_node_full_name(const struct device_node *np)
214 return np ? np->full_name : "<no-node>";
217 #define for_each_of_allnodes(dn) \
218 for (dn = of_allnodes; dn; dn = dn->allnext)
219 extern struct device_node *of_find_node_by_name(struct device_node *from,
221 extern struct device_node *of_find_node_by_type(struct device_node *from,
223 extern struct device_node *of_find_compatible_node(struct device_node *from,
224 const char *type, const char *compat);
225 extern struct device_node *of_find_matching_node_and_match(
226 struct device_node *from,
227 const struct of_device_id *matches,
228 const struct of_device_id **match);
230 extern struct device_node *of_find_node_by_path(const char *path);
231 extern struct device_node *of_find_node_by_phandle(phandle handle);
232 extern struct device_node *of_get_parent(const struct device_node *node);
233 extern struct device_node *of_get_next_parent(struct device_node *node);
234 extern struct device_node *of_get_next_child(const struct device_node *node,
235 struct device_node *prev);
236 extern struct device_node *of_get_next_available_child(
237 const struct device_node *node, struct device_node *prev);
239 extern struct device_node *of_get_child_by_name(const struct device_node *node,
243 extern struct device_node *of_find_next_cache_node(const struct device_node *);
244 extern struct device_node *of_find_node_with_property(
245 struct device_node *from, const char *prop_name);
247 extern struct property *of_find_property(const struct device_node *np,
250 extern int of_property_count_elems_of_size(const struct device_node *np,
251 const char *propname, int elem_size);
252 extern int of_property_read_u32_index(const struct device_node *np,
253 const char *propname,
254 u32 index, u32 *out_value);
255 extern int of_property_read_u8_array(const struct device_node *np,
256 const char *propname, u8 *out_values, size_t sz);
257 extern int of_property_read_u16_array(const struct device_node *np,
258 const char *propname, u16 *out_values, size_t sz);
259 extern int of_property_read_u32_array(const struct device_node *np,
260 const char *propname,
263 extern int of_property_read_u64(const struct device_node *np,
264 const char *propname, u64 *out_value);
266 extern int of_property_read_string(struct device_node *np,
267 const char *propname,
268 const char **out_string);
269 extern int of_property_read_string_index(struct device_node *np,
270 const char *propname,
271 int index, const char **output);
272 extern int of_property_match_string(struct device_node *np,
273 const char *propname,
275 extern int of_property_count_strings(struct device_node *np,
276 const char *propname);
277 extern int of_device_is_compatible(const struct device_node *device,
279 extern int of_device_is_available(const struct device_node *device);
280 extern const void *of_get_property(const struct device_node *node,
283 extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
284 #define for_each_property_of_node(dn, pp) \
285 for (pp = dn->properties; pp != NULL; pp = pp->next)
287 extern int of_n_addr_cells(struct device_node *np);
288 extern int of_n_size_cells(struct device_node *np);
289 extern const struct of_device_id *of_match_node(
290 const struct of_device_id *matches, const struct device_node *node);
291 extern int of_modalias_node(struct device_node *node, char *modalias, int len);
292 extern void of_print_phandle_args(const char *msg, const struct of_phandle_args *args);
293 extern struct device_node *of_parse_phandle(const struct device_node *np,
294 const char *phandle_name,
296 extern int of_parse_phandle_with_args(const struct device_node *np,
297 const char *list_name, const char *cells_name, int index,
298 struct of_phandle_args *out_args);
299 extern int of_parse_phandle_with_fixed_args(const struct device_node *np,
300 const char *list_name, int cells_count, int index,
301 struct of_phandle_args *out_args);
302 extern int of_count_phandle_with_args(const struct device_node *np,
303 const char *list_name, const char *cells_name);
305 extern void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align));
306 extern int of_alias_get_id(struct device_node *np, const char *stem);
308 extern int of_machine_is_compatible(const char *compat);
310 extern int of_add_property(struct device_node *np, struct property *prop);
311 extern int of_remove_property(struct device_node *np, struct property *prop);
312 extern int of_update_property(struct device_node *np, struct property *newprop);
314 /* For updating the device tree at runtime */
315 #define OF_RECONFIG_ATTACH_NODE 0x0001
316 #define OF_RECONFIG_DETACH_NODE 0x0002
317 #define OF_RECONFIG_ADD_PROPERTY 0x0003
318 #define OF_RECONFIG_REMOVE_PROPERTY 0x0004
319 #define OF_RECONFIG_UPDATE_PROPERTY 0x0005
321 struct of_prop_reconfig {
322 struct device_node *dn;
323 struct property *prop;
324 struct property *old_prop;
327 extern int of_reconfig_notifier_register(struct notifier_block *);
328 extern int of_reconfig_notifier_unregister(struct notifier_block *);
329 extern int of_reconfig_notify(unsigned long, void *);
331 extern int of_attach_node(struct device_node *);
332 extern int of_detach_node(struct device_node *);
334 #define of_match_ptr(_ptr) (_ptr)
337 * struct property *prop;
341 * of_property_for_each_u32(np, "propname", prop, p, u)
342 * printk("U32 value: %x\n", u);
344 const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
347 * struct property *prop;
350 * of_property_for_each_string(np, "propname", prop, s)
351 * printk("String value: %s\n", s);
353 const char *of_prop_next_string(struct property *prop, const char *cur);
355 bool of_console_check(struct device_node *dn, char *name, int index);
357 #else /* CONFIG_OF */
359 static inline const char* of_node_full_name(const struct device_node *np)
364 static inline struct device_node *of_find_node_by_name(struct device_node *from,
370 static inline struct device_node *of_find_node_by_type(struct device_node *from,
376 static inline struct device_node *of_find_matching_node_and_match(
377 struct device_node *from,
378 const struct of_device_id *matches,
379 const struct of_device_id **match)
384 static inline struct device_node *of_find_node_by_path(const char *path)
389 static inline struct device_node *of_get_parent(const struct device_node *node)
394 static inline struct device_node *of_get_next_child(
395 const struct device_node *node, struct device_node *prev)
400 static inline struct device_node *of_get_next_available_child(
401 const struct device_node *node, struct device_node *prev)
406 static inline struct device_node *of_find_node_with_property(
407 struct device_node *from, const char *prop_name)
412 static inline bool of_have_populated_dt(void)
417 static inline struct device_node *of_get_child_by_name(
418 const struct device_node *node,
424 static inline int of_device_is_compatible(const struct device_node *device,
430 static inline int of_device_is_available(const struct device_node *device)
435 static inline struct property *of_find_property(const struct device_node *np,
442 static inline struct device_node *of_find_compatible_node(
443 struct device_node *from,
450 static inline int of_property_count_elems_of_size(const struct device_node *np,
451 const char *propname, int elem_size)
456 static inline int of_property_read_u32_index(const struct device_node *np,
457 const char *propname, u32 index, u32 *out_value)
462 static inline int of_property_read_u8_array(const struct device_node *np,
463 const char *propname, u8 *out_values, size_t sz)
468 static inline int of_property_read_u16_array(const struct device_node *np,
469 const char *propname, u16 *out_values, size_t sz)
474 static inline int of_property_read_u32_array(const struct device_node *np,
475 const char *propname,
476 u32 *out_values, size_t sz)
481 static inline int of_property_read_string(struct device_node *np,
482 const char *propname,
483 const char **out_string)
488 static inline int of_property_read_string_index(struct device_node *np,
489 const char *propname, int index,
490 const char **out_string)
495 static inline int of_property_count_strings(struct device_node *np,
496 const char *propname)
501 static inline const void *of_get_property(const struct device_node *node,
508 static inline struct device_node *of_get_cpu_node(int cpu,
509 unsigned int *thread)
514 static inline int of_property_read_u64(const struct device_node *np,
515 const char *propname, u64 *out_value)
520 static inline int of_property_match_string(struct device_node *np,
521 const char *propname,
527 static inline struct device_node *of_parse_phandle(const struct device_node *np,
528 const char *phandle_name,
534 static inline int of_parse_phandle_with_args(struct device_node *np,
535 const char *list_name,
536 const char *cells_name,
538 struct of_phandle_args *out_args)
543 static inline int of_parse_phandle_with_fixed_args(const struct device_node *np,
544 const char *list_name, int cells_count, int index,
545 struct of_phandle_args *out_args)
550 static inline int of_count_phandle_with_args(struct device_node *np,
551 const char *list_name,
552 const char *cells_name)
557 static inline int of_alias_get_id(struct device_node *np, const char *stem)
562 static inline int of_machine_is_compatible(const char *compat)
567 static inline bool of_console_check(const struct device_node *dn, const char *name, int index)
572 static inline const __be32 *of_prop_next_u32(struct property *prop,
573 const __be32 *cur, u32 *pu)
578 static inline const char *of_prop_next_string(struct property *prop,
584 #define of_match_ptr(_ptr) NULL
585 #define of_match_node(_matches, _node) NULL
586 #endif /* CONFIG_OF */
588 #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
589 extern int of_node_to_nid(struct device_node *np);
591 static inline int of_node_to_nid(struct device_node *device) { return 0; }
594 static inline struct device_node *of_find_matching_node(
595 struct device_node *from,
596 const struct of_device_id *matches)
598 return of_find_matching_node_and_match(from, matches, NULL);
602 * of_property_count_u8_elems - Count the number of u8 elements in a property
604 * @np: device node from which the property value is to be read.
605 * @propname: name of the property to be searched.
607 * Search for a property in a device node and count the number of u8 elements
608 * in it. Returns number of elements on sucess, -EINVAL if the property does
609 * not exist or its length does not match a multiple of u8 and -ENODATA if the
610 * property does not have a value.
612 static inline int of_property_count_u8_elems(const struct device_node *np,
613 const char *propname)
615 return of_property_count_elems_of_size(np, propname, sizeof(u8));
619 * of_property_count_u16_elems - Count the number of u16 elements in a property
621 * @np: device node from which the property value is to be read.
622 * @propname: name of the property to be searched.
624 * Search for a property in a device node and count the number of u16 elements
625 * in it. Returns number of elements on sucess, -EINVAL if the property does
626 * not exist or its length does not match a multiple of u16 and -ENODATA if the
627 * property does not have a value.
629 static inline int of_property_count_u16_elems(const struct device_node *np,
630 const char *propname)
632 return of_property_count_elems_of_size(np, propname, sizeof(u16));
636 * of_property_count_u32_elems - Count the number of u32 elements in a property
638 * @np: device node from which the property value is to be read.
639 * @propname: name of the property to be searched.
641 * Search for a property in a device node and count the number of u32 elements
642 * in it. Returns number of elements on sucess, -EINVAL if the property does
643 * not exist or its length does not match a multiple of u32 and -ENODATA if the
644 * property does not have a value.
646 static inline int of_property_count_u32_elems(const struct device_node *np,
647 const char *propname)
649 return of_property_count_elems_of_size(np, propname, sizeof(u32));
653 * of_property_count_u64_elems - Count the number of u64 elements in a property
655 * @np: device node from which the property value is to be read.
656 * @propname: name of the property to be searched.
658 * Search for a property in a device node and count the number of u64 elements
659 * in it. Returns number of elements on sucess, -EINVAL if the property does
660 * not exist or its length does not match a multiple of u64 and -ENODATA if the
661 * property does not have a value.
663 static inline int of_property_count_u64_elems(const struct device_node *np,
664 const char *propname)
666 return of_property_count_elems_of_size(np, propname, sizeof(u64));
670 * of_property_read_bool - Findfrom a property
671 * @np: device node from which the property value is to be read.
672 * @propname: name of the property to be searched.
674 * Search for a property in a device node.
675 * Returns true if the property exist false otherwise.
677 static inline bool of_property_read_bool(const struct device_node *np,
678 const char *propname)
680 struct property *prop = of_find_property(np, propname, NULL);
682 return prop ? true : false;
685 static inline int of_property_read_u8(const struct device_node *np,
686 const char *propname,
689 return of_property_read_u8_array(np, propname, out_value, 1);
692 static inline int of_property_read_u16(const struct device_node *np,
693 const char *propname,
696 return of_property_read_u16_array(np, propname, out_value, 1);
699 static inline int of_property_read_u32(const struct device_node *np,
700 const char *propname,
703 return of_property_read_u32_array(np, propname, out_value, 1);
706 #define of_property_for_each_u32(np, propname, prop, p, u) \
707 for (prop = of_find_property(np, propname, NULL), \
708 p = of_prop_next_u32(prop, NULL, &u); \
710 p = of_prop_next_u32(prop, p, &u))
712 #define of_property_for_each_string(np, propname, prop, s) \
713 for (prop = of_find_property(np, propname, NULL), \
714 s = of_prop_next_string(prop, NULL); \
716 s = of_prop_next_string(prop, s))
718 #define for_each_node_by_name(dn, name) \
719 for (dn = of_find_node_by_name(NULL, name); dn; \
720 dn = of_find_node_by_name(dn, name))
721 #define for_each_node_by_type(dn, type) \
722 for (dn = of_find_node_by_type(NULL, type); dn; \
723 dn = of_find_node_by_type(dn, type))
724 #define for_each_compatible_node(dn, type, compatible) \
725 for (dn = of_find_compatible_node(NULL, type, compatible); dn; \
726 dn = of_find_compatible_node(dn, type, compatible))
727 #define for_each_matching_node(dn, matches) \
728 for (dn = of_find_matching_node(NULL, matches); dn; \
729 dn = of_find_matching_node(dn, matches))
730 #define for_each_matching_node_and_match(dn, matches, match) \
731 for (dn = of_find_matching_node_and_match(NULL, matches, match); \
732 dn; dn = of_find_matching_node_and_match(dn, matches, match))
734 #define for_each_child_of_node(parent, child) \
735 for (child = of_get_next_child(parent, NULL); child != NULL; \
736 child = of_get_next_child(parent, child))
737 #define for_each_available_child_of_node(parent, child) \
738 for (child = of_get_next_available_child(parent, NULL); child != NULL; \
739 child = of_get_next_available_child(parent, child))
741 #define for_each_node_with_property(dn, prop_name) \
742 for (dn = of_find_node_with_property(NULL, prop_name); dn; \
743 dn = of_find_node_with_property(dn, prop_name))
745 static inline int of_get_child_count(const struct device_node *np)
747 struct device_node *child;
750 for_each_child_of_node(np, child)
756 static inline int of_get_available_child_count(const struct device_node *np)
758 struct device_node *child;
761 for_each_available_child_of_node(np, child)
768 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
769 static const struct of_device_id __of_table_##name \
770 __used __section(__##table##_of_table) \
771 = { .compatible = compat, \
772 .data = (fn == (fn_type)NULL) ? fn : fn }
774 #define _OF_DECLARE(table, name, compat, fn, fn_type) \
775 static const struct of_device_id __of_table_##name \
776 __attribute__((unused)) \
777 = { .compatible = compat, \
778 .data = (fn == (fn_type)NULL) ? fn : fn }
781 typedef int (*of_init_fn_2)(struct device_node *, struct device_node *);
782 typedef void (*of_init_fn_1)(struct device_node *);
784 #define OF_DECLARE_1(table, name, compat, fn) \
785 _OF_DECLARE(table, name, compat, fn, of_init_fn_1)
786 #define OF_DECLARE_2(table, name, compat, fn) \
787 _OF_DECLARE(table, name, compat, fn, of_init_fn_2)
790 * struct of_changeset_entry - Holds a changeset entry
792 * @node: list_head for the log list
793 * @action: notifier action
794 * @np: pointer to the device node affected
795 * @prop: pointer to the property affected
796 * @old_prop: hold a pointer to the original property
798 * Every modification of the device tree during a changeset
799 * is held in a list of of_changeset_entry structures.
800 * That way we can recover from a partial application, or we can
801 * revert the changeset
803 struct of_changeset_entry {
804 struct list_head node;
805 unsigned long action;
806 struct device_node *np;
807 struct property *prop;
808 struct property *old_prop;
812 * struct of_changeset - changeset tracker structure
814 * @entries: list_head for the changeset entries
816 * changesets are a convenient way to apply bulk changes to the
817 * live tree. In case of an error, changes are rolled-back.
818 * changesets live on after initial application, and if not
819 * destroyed after use, they can be reverted in one single call.
821 struct of_changeset {
822 struct list_head entries;
825 #ifdef CONFIG_OF_DYNAMIC
826 extern void of_changeset_init(struct of_changeset *ocs);
827 extern void of_changeset_destroy(struct of_changeset *ocs);
828 extern int of_changeset_apply(struct of_changeset *ocs);
829 extern int of_changeset_revert(struct of_changeset *ocs);
830 extern int of_changeset_action(struct of_changeset *ocs,
831 unsigned long action, struct device_node *np,
832 struct property *prop);
834 static inline int of_changeset_attach_node(struct of_changeset *ocs,
835 struct device_node *np)
837 return of_changeset_action(ocs, OF_RECONFIG_ATTACH_NODE, np, NULL);
840 static inline int of_changeset_detach_node(struct of_changeset *ocs,
841 struct device_node *np)
843 return of_changeset_action(ocs, OF_RECONFIG_DETACH_NODE, np, NULL);
846 static inline int of_changeset_add_property(struct of_changeset *ocs,
847 struct device_node *np, struct property *prop)
849 return of_changeset_action(ocs, OF_RECONFIG_ADD_PROPERTY, np, prop);
852 static inline int of_changeset_remove_property(struct of_changeset *ocs,
853 struct device_node *np, struct property *prop)
855 return of_changeset_action(ocs, OF_RECONFIG_REMOVE_PROPERTY, np, prop);
858 static inline int of_changeset_update_property(struct of_changeset *ocs,
859 struct device_node *np, struct property *prop)
861 return of_changeset_action(ocs, OF_RECONFIG_UPDATE_PROPERTY, np, prop);
865 /* CONFIG_OF_RESOLVE api */
866 extern int of_resolve_phandles(struct device_node *tree);
868 #endif /* _LINUX_OF_H */